Testing for differential item functioning within the EQ-5D.


We test for the presence of differential item functioning (DIF) in the EQ-5D health-related quality-of-life instrument, using data from a large clinical trial in acute stroke (ISRCTN 99414122). DIF occurs when subjects in different subsets of a sample respond differently to items in a measurement instrument, despite possessing the same latent traits. The… (More)
DOI: 10.1177/0272989X12465016


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